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For an introduction to Grand Unified Theories see Langacker (1981) and Ross (1981, 1984). The idea of grand unification first appeared in Pati and Salam (1973) and Georgi and Glashow (1974), where the minimal SU(5) model was first constructed. The SO(10) GUT was constructed by H. Georgi (unpublished) and in Fritzsch and Minkowski (1975), see also Georgi and Nanopoulos (1979). The E6 gauge group was first considered in Gursey et al. (1976) and flipped SU(5) in Barr (1982, 1989), see also Derendinger et al. (1984). The left–right symmetric model was considered in Mohapatra and Pati (1975a,b). The joining of the SM couplings according to the renormalization group was pointed out in Georgi et al. (1974) and the renormalization ...

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